added link to build

README.md

@@ -1,7 +1,7 @@
 ![Chama](documentation/figures/logo.png)
 =========================================
 
-![build](https://github.com/sandialabs/chama/workflows/build/badge.svg)
+[![build](https://github.com/sandialabs/chama/workflows/build/badge.svg)](https://github.com/sandialabs/chama/actions/workflows/build_tests.yml)
 [![Coverage Status](https://coveralls.io/repos/github/sandialabs/chama/badge.svg?branch=main)](https://coveralls.io/github/sandialabs/chama?branch=main)
 [![Documentation Status](https://readthedocs.org/projects/chama/badge/?version=latest)](http://chama.readthedocs.io/en/latest/?badge=latest)
 [![Downloads](https://pepy.tech/badge/chama)](https://pepy.tech/project/chama)